Leno-weave loom



May 26, '1953 J. BAMBI-QT 2,63 ,733

' LENO-WEAVE LOOM Filed March 20, 1951 5 Sheets-Sheet 1 FIG.1

v INVENTORL' "*"nbam Bdmenf y-z w May 26, 1953 J. .BAMERT LENO-WEAVE LOOM Filed March 20, 1951 5 Sheets-Sheet 2 M "WY T I Nmm m wi h wa M m 7 May 26, 1953 J; BAMERT 2,639,733

LENO-WEAVE LOOM Filed March 20, 1951 5 Sheets-Sheet 3 INVENTORI r51. ann 8am m y 25, 9 3 ,1. BAMERT 2,639,733

/ 'LENO-WEAVE LOOM Filed March 20, 1951 5 s t -s t 4 IN VEN TOR 7 736mm rim "1" Mam-4W AH-om ey May 26, 1953 J. BAMERT 2,639,733

LENO-WEAVE LOOM Filed March 20, 1951 5 Sheets-SheetB "I ill aflanfl Bamm" .wm- 7652 v 2 W A'Hormey Patented May 26, 1953 LENO-WEAVE LOOM Johann Bamert, Gibswil, Switzerland, assignor to Keller & 00., Neuthal, Gibswil, Switzerland Application March 20, 1951, Serial No. 216,490 In Switzerland June 3, 1950 11 Claims.

1 My invention relates to a loom for Weaving leno cloth with the aid of thread guiding elements which comprise openings'for the passage of warp threads which have to be intercrossed, which elements are oscillatable through a gear drive to produce the leno weave, the weft threads being affording anaccurate crossing operation on one hand and a high drive speed and a high loom output on the other hand. No difiiculties are involved in providing means for varying the angle of swing of the said elements for the purpose of changing the crossing operation.

The thread guiding elements are preferably constituted by toothed discs which mesh with toothed rollers. Such discs require comparatively little space and may be guided laterally. A plurality of parallel rows of such discs with individual drives may be arranged on the loom thus increasing the range of possible patterns.

Two forms of the loom according to my present invention are shown in the accompanying drawing, in which one comprises one row, and the other comprises two parallel rows of thread guiding discs.

Fig. 1 shows a side elevation of a loom com- .prising a single row of thread guiding discs, in section on the line II in Fig. 2,

Fig. 2 shows a front elevation in section on the line IIII of Fig. 1,

Fig. 3 shows a loom comprising two rows of thread guiding discs in side elevation and in section on the line Il lf-III of Fig. 4,

Fig. 4 shows a front elevation in section on the line IVIV of Fig. 3,

Fig. 5 shows the stop means in side elevation and part section and in the other terminal position of a pivotable stop arm than in Figs. 1

and 3,

Fig. 6 is a perspective view, in a larger scale,

of the operating parts of a terminal switch,

Fig. '7 is an end view, in part section and larger scale of an electromagnetic brake mounted.v on

the reversible motor, and

Fig. 8 depicts a wiring diagram.

In the first example (Figs. 1, 2) a motor 2 is mounted on the foot I of the loom frame and drives the loom crankshaft 4 via a belt drive 3 and a clutch (not shown). The crankshaft l is mounted in the two frame side-shields 5, 6 and also in two bearing blocks I and 8. In Fig. 2, the right-hand end of crankshaft 4 carries a cam 9 for biasing the contact arm ID to produce a current pulse. The slay I3 with shuttle track I4 and reed I5 is reciprocated, in known manner, from the two cranks II of shaft 4 via the links I2. The warp threads II pass from the warp beam I6 via a guide roller I8 and two guide rods I9, 20 to the reed I5. The cloth passes to the cloth beam 23 via a guide rod 2I and a guide roller 22.

The warp threads I! intermediate of rod 20 and reed I5, pass through rotary guidediscs 24 of which each comprises two diametrically opposite circular holes for receiving a warp thread 11 each, as shown in Figs. 1 and 2. Two diamertical- 1y opposite zones of each thread guiding disc 24, are disposed in the gap between two reeds 25 and 26, which form left-hand and right-hand guide stops for the discs 24. Each of the two warp threads I! of the individual discs 24 within range of the reeds 25, 26 passes through a gap between the latter. The discs 2lwhich in operation are oscillated for the purpose of forming the desired leno wave-are shown in their inoperative position in Fig. 1, in which their two cross-holes are vertically superposed and spaced from each other in accordance with the desired width of the shed formed by the threads II.

' When the discs 24 perform one complete revolution, starting from the terminal position shown, their two warp threads I! are inte'r-crossedso as to produce a so-called half cross gauze." After picking the weft thread, the discs 24 are turned back, thus abolishing the warp linkage on the free stretch of the warp threads. The operation described then is repeated as required. When the guide discs 24 perform' 1 /2 revolutions, so-called full cross gauzes are produced.

The discs 24 through a rim gear 21 mesh with two toothed rollers 28, 29 which'are disposed in two frame portions 30, 3I in parallel superjacent relation. The reeds 25, 26 also are mounted on the frame portions 30, 3|. The rollers 28, 29 at both ends carry a driving gear wheel 3% which is engaged by an intermediate wheel 35, whereby the two rollers 28, 29 are positively coupled for rotation.

As shown in Fig. 2, the shaft 31 of the bottom 3 roller 28 is extended to the left beyond a bearing block 36 disposed at l, and has a pinion 38 afiixed to it, which pinion meshes with a gear wheel 39 of which the shaft 49 is mounted on the loom frame. The shaft carries an arm 4| which by means of a screw is amxed to the gear wheel 39. The arm 4| at its free end has as shown in Figs. 1, 2, 3 and 5 a lateral stop 42 for alternating co-action with two opposite counterstops 43 of which each is guided vertically movable in a framelike bearing 44. Each counterstop 43 is engaged by a tension spring which tends to hold the stop in its inoperative position, in which it is seated through a thickened portion on the yoke of its bearing 44. The two bearings 44 are detachably secured in any known way, such as by toggle screws, to the foot I of the loom frame. The parts 39 and ll-45 together form a mechanical stop means for the rollers 28 and 29 by alternate coaction of stop 42 of stop-arm 4| with the hook of each of the counter-stops 43 against the tension of springs '45, as a result of the oscillation of gear wheel :39, depending upon the direction of rotation of .roller shaft 31, as explained hereafter.

In Fig. 2 the left-hand of the roller shaft 31 through a chain drive 45 is positively connected for rotation to the shaft 41 of a terminal switch disposed in a box 48. On the driving shaft 41 are mounted two switch arms 49 and 59 (Figs.

"6 "and 8) each of which may be adjusted by vided with'a fan El. The latter serves for blow- 1 ing cooling air through the motor housing when the loom is in operation. The spent cooling air is conducted to an electromagnetica-lly actuated brake 58 (Fig. 7) associated with motor 55. The brake '58 comprises a brake disc 59 afiixed to motor shaft 55. Two brake rods 513 pivoted on pins 6| c'oact with said disc 59, and each of said rods through a link 52 is coupled to an arm 64 which is mounted on an axle pin 63 and biased by a tension spring 65. A rod is pivoted to the arm 64 and passes through a stationar guide means 6.1 and carries the core which is associated with 'a solenoid indicated at 69.

In the circuit diagram (Fi 8) H3 denotes the starting handle by means of which a switch ll is actuated in order to engage and disengage the clutch (not shown) disposed between the belt drive 3 and the crank-shaft 4 in order to start and stop the loom. When the switch "H is closed, the control of the reversible motor 56 is prepared. The contact arm IE3 is periodically actuated through the cam 9 disposed on crankshaft '4, i. e. at each revolution of the shaft. The two relays 12, 13 thus respond alternatingly, being energized through the rotating switch arms "49, 50 and the contact arms 52, 53 respectively, of the terminal switch. Thereby holding contacts '14 and 15 respectively are closed, whereupon the respective relay after eliminating the current impulse produced via the contact arm It, is held in its position via the holding resistance 16 'until the holding circuit is 'deenergized via the terminal switch '(48) and so on. Owing to such versible motor '56 is periodically switched over as required. By virtue of the corresponding periodical excitation of the solenoid 59 which is connected (in a manner not shown) to the electric lead system, the core 68 is attracted or raised, whereby the arm 64 (against the action of its tension spring 65) is rocked and the two brake rods 69 are rendered inoperative via the links 62 so that the shaft 55 of the reversible motor 55 is tripped for rotation. The brake rods 60 normally are disengaged only when the motor is operating. In order that the reversing cylinder (not shown) may be manually rotated, the brake rods 60 are manually tripped and locked by selfaoting means, a safety contact 19 being opened in order to prevent a control of the realys 12 and 13.

Two push buttons 71, '18 disposed at different points on the loom, permit to energize the two relays l2, '13 when the loom is out of operation.

The lower roller 28 is driven from motor 56 via the belt drive 54 which admits slippage, whereby the said roller is oscillated, and such 0s,- oillating movement is positively transmitted via the intermediary wheels 35 onto the upper roller 29. The guide discs 24 disposed between the two rollers 28, 29 thus are oscillated (in a suitable gear ratio) about their axis for the purpose of producing the leno weave. The gear wheel 39 thus is coercively oscillated from theshaft 51 of the lower roller 28 via the pinion 38. In the final phases of the oscillations of gear wheel 39, the abutment 42 of the arm 4! which fol .lows such oscillations, alternatingly hits the spring-loaded counterstops 43 so as to elastically dampen the oscillations of wheel 39 and Of the two rollers 28, 29. Accordingly, the braking :action of the two rods fill .on the brake disc 59 of motor 56 is aided, thus uniformly maintaining the angle of swing of the guide discs '24.

The warp threads may be drawninto the guide discs 24, since the cylinder of the reversible motor 56 is manually rotatable. By actuating the push buttons i1 and 1B, the rollers 28, 25 maybe turned back from the motor 55 to permit of working backwards, .or opening the leno weave for the .purpose of locating the point of thread failure.

When the said angle of swing has to be changed, the gear wheel .39 which carries alon the abutment arm 4!, has to "be exchanged for a gear wheel having another diameter, it re- :quired also the pinion J38. Forsuc'h purpose, the

axle .pin 40 of the wheel 39 is detachably dis posed in vertical slots of the two frame portions (Fig. .2) which carry the axle 40. Furthermore, the counterstops 43 and their bearings have to .be replaced bysuitable counterstops having corresponding bearings, and theswitch arms 49 and 50 of the terminal .switch have to be reset .jwith respect to their angular position on their shaft .ing housed in a boring through wheel 39, .and arm 4| being eliminated; the stop 42 may then be adjustable with respect to the angle of ro'tation of wheel 39 by providing on said wheel a plurality of borings or a slot. .In place of two stop means, only one such means could be provided for the rollers 28, 29 and the row of guide discs.

The second form of invention shown in Figs. 3 and 4 difiers from the first form in that two rows of guide discs 24, 24a are provided, a separate pair of rollers 28a, 29a and all accessories being provided for operating the second row of discs, just as for the pair of rollers 28, 29. The accessory parts are designated by the same numerals as in the first form of invention, but supplemented by the sufiix a.

Warp threads Ila are supplied from an upper warp beam Mia to the additional row of discs 24a which, as shown in Fig. 3, are put in front of the discs 24. The second row of disc 24a is driven from a reversible motor 56a via a belt drive 54a, to which motor is associated an electromagnetic brake 69a as well as a terminal switch 48a. The second rowof discs 24a with accessories forms an aggregate per se to which the current impulse also is transmitted via the cam 9 (Fig. 4) provided on the crankshaft 4. The cam 9 comprises two control arms, i. e. one for the contact arm H! which is associated with the drive for the pair of rollers 28, and 29, and the other for the contact arm Ilia pertaining to the drive for the pair of rollers 28a, 29a. The gear wheel 39a with stop arm Ma serves for limiting the angle of swing of the discs 24a, which arm through a lateral stop 42a alternatingly coacts with the two counterstops 43a which are loaded by tension springs 45a. Each row of thread-guiding discs thus is oscillated from a separate gear drive which forms a component of an aggregate provided for each row, which asgregate comprises a reversible motor, a self-acting brake and a stop means.

Each pair of rollers 28, 29 and 28a, 29a thus operates per se. The guide discs 24, 24a may have the same angle of swing or different angles of swing inter se, in accordance with the desired leno weave. Again, the pairs of rollers 28, 29 and 28a, 29a may swing in one and the same direction or in opposite direction. The construction may be such that one pair of rollers is at standstill, whilst the other is rotated so as to give origin to an alternating rotation of the guide discs of both rows.

What I claim and desire to secure by Letters Patent is:

1. In a leno-weave loom operating by means of thread-guiding elements apertu-red for the passage of warp threads to be interconnected, the said elements being oscillated through a gear drive for the purpose of producing the leno weave, the weft thread being picked in the terminal positions of said elements, a reversible motor for oscillating the gear drive of said elements, means for controlling the motor from the loom mechanism, a self-acting brake associated with the motor, and at least one stop means associated with the gear drive and adapted to become effective together with the said brake.

2. A leno-weave loom as set forth in claim 1, in which said brake is electromagnetically actuated, and the reversible motor is provided with a fan for the purpose of blowing cooling-air through the casing, which air subsequently is conducted to said brake.

3. A leno-weave loom as set out in claim 1, in which the said stop means comprises a stop which is positively moved by said gear drive and is adapted to alternatingly coact with springloaded counterstops in the terminal phases of the oscillations of said drive.

4. A leno-weave loom, as set out in claim 3, in which said elements are peripherally toothed, and in which the reversible motor through a belt drive transmits motion to two peripherally toothed rollers which are in meshing engagement with a row of said elements, the latter being disposed between the two rollers, and the said rollers transmitting motion to the stop which coacts with said counterstops.

5. A leno-weave loom as set forth in claim 3, in which for the purpose of changing the angle of swing of the thread-guiding elements, two switch arms of a terminal switch associated with the reversible motor are adjustably mounted on their shaft with respect to their angular position, the said shaft being positively actuated by the loom mechanism, and in which at least the counterstops of the stop means are removably mounted on said loom, whereby different sets 01' said counterstops can be interchanged.

6. A leno-weave loom as set out in claim 5, in which said terminal switch has a contact arm which is periodically actuated by said switch arms, for the purpose of producing a current pulse, and a relay adapted to respond when closed across the terminal switch in order to energize a holding contact provided for said relay.

7. A leno-weave loom as set out in claim 5, in which the positively moved stop of said stop means is removably associated with said gear drive.

8. A l-eno-weave loom as claimed in claim '7, in

which said stop comprises a gear-wheel meshing with said gear drive and an abutment arm connected to said gear-wheel and adapted to engage said counterstops, said gear-wheel being adapted to transmit motion from said geardrive to said arm, and being removably mounted on its shaft, whereby difierent gear wheels can be interchanged.

9. A leno-weave loom as set out in claim 1, comprising two rows of thread-guiding elements, each row being oscillated through a separate gear drive which forms a component of an aggregate provided for each row, the said aggregate including a reversible motor, a self-acting brake and a stop means.

10. A' leno-weave loom as claimed in claim 9, in which said elements are peripherally toothed, and in which, in each of said aggregates, the reversible motor transmits through a belt drive the driving motion for two peripherally toothed rollers, a row of said elements being disposed between and geared with said two rollers, said rollers transmitting motion to the associated stopmeans which coacts with counterstops.

11. A leno-weave loom as set out in claim 10, in which the warp threads are conducted from an associated warp beam to each row of threadguiding elements.

JOHANN' BAMERT.

References Cited in the file of this patent UNITED STATES PATENTs Number Name Date 2,356,964 Alderfer Aug. 29, 1944 2,412,354 Parker Dec. 10, 1946 2,412,355 Parker Dec. 10, 1946 2,480,395 Clark Aug. 30, 1949 

